From: Kent Dahl <kentda+news@...>
Date: 2003-08-01T17:28:08+09:00
Subject: Re: Test::Unit leaving phanthom objects in ObjectSpace?

james_b wrote:
> I have some code that examines the objects in ObjectSpace and returns a 
> set with all those that meet some criteria.  I found during unit testing 
> that, although I have just one (global) varible refering to an object of 
> a particular type, iterating over ObjectSpace.each_object returns 
> numerous objects of this class after some test methods have been called.
[snip]
> After four test methods are called, ObjectSpace still holds two objects 
> of class Foo, although the code only has that one variable for the one 
> instance of Foo needed.
> 
> Is this a quirk of Test::Unit?  Or of ObjectSpace?
> 
> I've tried adding a call to ObjectSpace.garbage_collect
> before the iteration, but it doesn't change anything.
[snip]
> I'm using ruby 1.8.0 (2003-05-26) [i386-mswin32] and whatever Test::Unit 
> that comes with that (there's no version number in unit.rb)


I cannot reproduce it using ruby 1.8.0 (2003-07-24) [i686-linux], so 
perhaps it was a temporary problem that has been fixed. Suggest you try 
a newer version to see if it helps.

[kentda@localhost ruby]$ ruby1.8 -v setup.rb
ruby 1.8.0 (2003-07-24) [i686-linux]
Loaded suite ATest
Started
.....
Finished in 0.003337 seconds.

4 tests, 0 assertions, 0 failures, 0 errors
Foos:4
Foos:0
[kentda@localhost ruby]$ cat setup.rb
require 'test/unit'
class Foo
end
class ATest < Test::Unit::TestCase
   def setup
     $foo = Foo.new
   end
   def teardown
     $foo = nil
   end
   def test_a; end
   def test_b; end
   def test_c; end
   def test_d; end
end

def num_foos
   n = 0
   ObjectSpace.each_object(Foo){|i| n+=1 }
   print "Foos:", n, "\n"
end

if __FILE__ == $0
   require 'test/unit/ui/console/testrunner'

   Test::Unit::UI::Console::TestRunner.run ATest.suite
   num_foos
   ObjectSpace.garbage_collect
   num_foos
end


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